Add connected clients popup per AP

Clicking an AP name opens a modal showing all wireless clients currently
associated with that AP: hostname/MAC, IP, SSID, band, channel, signal
strength with quality label, TX/RX link rate, and connection uptime.

Backend: GET /api/ap-clients?mac=&site_key= calls the Omada clients
endpoint with filters.apMac; falls back to client-side filtering if the
controller doesn't support that query param.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/main.py

@@ -263,6 +263,21 @@ async def api_reboot(request: Request, db: Session = Depends(get_db)):
     return {"status": "ok", "mac": mac}
 
 
+@app.get("/api/ap-clients")
+async def api_ap_clients(request: Request, mac: str = "", site_key: str = ""):
+    user = get_current_user(request)
+    if not user:
+        raise HTTPException(status_code=401, detail="Not authenticated")
+    if not mac or not site_key:
+        raise HTTPException(status_code=400, detail="mac and site_key required")
+    try:
+        clients = await omada_client.get_ap_clients(mac, site_key)
+        return {"clients": clients}
+    except Exception as exc:
+        logger.error("Failed to fetch clients for AP %s: %s", mac, exc)
+        raise HTTPException(status_code=502, detail=str(exc))
+
+
 @app.post("/api/reboot-bulk")
 async def api_reboot_bulk(request: Request, db: Session = Depends(get_db)):
     user = get_current_user(request)